Projecting optical device

Abstract

A projecting optical device which simultaneously projects one object onto two or more different screens has a first screen, a second screen, a first projecting optical system which projects the object onto the first screen, and a second projecting optical system which projects the object onto the second screen and does not share an optical element with the first projecting optical system. A first base line connecting the center of the object to the center of the image projected on the first screen by the first optical system and a second base line connecting the center of the object to the center of the image projected on the second screen by the second optical system are not parallel to each other.

What is claimed is: 
     
       1. A projecting optical device which simultaneously projects one object onto two or more different screens comprising: a first screen;   a second screen;   a first projecting optical system which projects the object onto said first screen and has an optical element; and   a second projecting optical system which projects the object onto said second screen and has an optical element other than the optical element of the first projecting optical system, wherein said first optical system does not share any portion of its optical path with said second optical system.     
     
     
       2. A projecting optical device as claimed in claim 1, wherein a first base line connects the center of the object and the center of the image projected on the first screen by said first optical system, said first base line being inclined relative to the normal line of the object, and at least one lens included in said first projecting optical system is eccentric. 
     
     
       3. A projecting optical device as claimed in claim 1, wherein said first projecting optical system is a coaxial optical system whose base line connecting the center of the object and the center of the image projected on the first screen by said first optical system is parallel to the normal line of the object. 
     
     
       4. A projecting optical device as claimed in claim 1, wherein a first base line connecting the center of the object and the center of the image projected on said first screen by said first optical system and a second base line connecting the center of the object and the center of the image projected on said second screen by said second optical system are symmetric with respect to the normal line of the object. 
     
     
       5. A projecting optical device as claimed in claim 1, wherein a first base line connecting the center of the object and the center of the image projected on said first screen by said first optical system is inclined relative to the normal line of the object, and said first projecting optical system is an optical system including an afocal optical system. 
     
     
       6. A projecting optical device as claimed in claim 1, wherein a first base line connecting the center of the object and the center of the image projected on said first screen by said first optical system is inclined relative to the normal line of the object, and said first projecting optical system is a coaxial afocal optical system.